I think this is just playing to the anti immigrant crowd for votes.
http://immigration.findlaw.com/immigration/immigration-citizenship-naturalization/immigration-citizenship-naturalization-test-overview.htmlWhat to Expect on the Naturalization Test
During the course of the naturalization process, an applicant for U.S. citizenship will be scheduled for an interview at a local U.S. Citizenship and Immigration Services office. At the interview, the applicant will be tested on his or her ability to read, write, and speak English, and will also be given a civics test to measure his or her understanding and knowledge of U.S. history and government.
Note: Some applicants may be exempt from all or part of the testing process due to their age or mental condition.
Language Test
The English proficiency test demonstrates that the applicant will be able to take part in the economic and social aspects of life in the U.S. The test has three parts:
Reading: To test reading ability, an applicant may be asked to read out loud certain parts of Form N-400, Application for Naturalization.
Writing: To test writing ability, an applicant will be asked to write one or two simple sentences.
Speaking: An applicant's speaking ability will be tested when the applicant answers questions about himself or herself during the course of the interview.
The applicant need not be bilingual to pass this test; basic proficiency is adequate. If you have problems with English, you may want to consider taking an English as a Second Language course prior to naturalization.